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Property, plant and equipment (Details) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	CAD 23,673	CAD 9,995
Less: Accumulated depreciation	(7,787)	(3,737)
Property, Plant and Equipment, Net	17,290	6,469
Net Book Value	15,886	6,258
Electric Generation Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	CAD 10,553	4,957
Electric Generation Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Electric Generation Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	131 years
Electric Transmission [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	CAD 2,799	1,603
Electric Transmission [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	28 years
Electric Transmission [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	75 years
Electric Distribution [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	CAD 5,715	2,503
Electric Distribution [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	11 years
Electric Distribution [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	80 years
Gas, Transmission and Distribution Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	CAD 2,895	0
Gas, Transmission and Distribution Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Gas, Transmission and Distribution Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	85 years
Other Energy Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	CAD 1,711	932
Other Energy Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Other Energy Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	50 years
Construction in Progress [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	CAD 1,404	CAD 211

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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